TRT30 is a true three-phase, fully automatic, test set specially designed for turns ratio, phase shift and excitation current measurement of power, distribution and instrument transformers. TRT30 determines the transformer turns ratio by accurately measuring the voltages across the unloaded transformer windings and then displaying the ratio of these voltages (ratios range from 0,8 to 15 000).

TRT30 is based on state of the art technology, using the most advanced technique available today. The test set can be used to test single-phase and three-phase transformers, both with and without taps in accordance with the requirements of the IEC 60076-1 standard.
For three-phase measurement, the test set is connected to all three phases of the transformer to be tested. If specific vector diagrams for different types of transformers are selected, the TRT30 will run a specific test for each transformer type (i.e., single phase, Delta to y, Y to delta, Delta to delta, or Y to y) without the need to switch test hookup cables. Turns ratio, phase shift and excitation current are displayed on the display obtained with true three-phase and single-phase tests.
TRT30 lets users enter a transformer’s nameplate voltages for the turns-ratio calculation. This feature eliminates any error otherwise caused by an operator’s manual calculation. The TRT30 also compares the test result with the calculated ratio and prints out the % of error for each test. It is easy to read display and easy to follow menu. View the result on the display. There is enough memory in TRT30 to store 100 test records and each record consists of 100 test readings. All measurements are time and date stamped. The measurements can be printed on a built-in thermal printer using the Print button.
Transformer excitation current as well as phase shift angles helps to detect transformers shorted turns or unequal number of turns connected in parallel. Operating conditions messages or error messages identify incorrect test conditions, abnormal operating condition or winding problems.
TRT30 has very high ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing appropriate hardware and software.

All measurements can also be exported to a PC with the DV-Win software. The software connects a PC to TRT30 with USB cable. Using the DV-Win it is possible to report and analyze results. Also TRT30 can be controlled and test status could be viewed using the DV-Win software.

TRT30 is programmed to automatically test turns ratio, phase shift and excitation current of power, distribution and instrument transformer types defined by CEI/IEC standards.